Hi Frank,
Looking good! The stones, water (scales and roughness) and lighting are pretty sweet. The overcast on the right brings warmth to the image, I like that.
Your choice of models is good, however the lighting on the models (still not the easiest thing in TG) is a bit "flat". Can't put my finger on it and think of which specific setting you would have to change, maybe the translucency because in the bigger bushes it seems a bit too high, but that's just thinking out loud.
Another thing, which is personal, is that I really like a waterdecay color. The transparency looks too white and I'd like to see it more greenish. Think that would be more realistic.
Besides that, you still have it
Martin